Reversible calipers.



G. B. FBNNO.

REVERSIBLE GALIPERS.

APPLICATION FILED APR.21, 1913.

1,109,056, Patented Sept. 1,1914. 7

THE NORRIS PETERS CO.. PHOTU-LILQHD), WASHINGTUN, D C,

mg outside diameters. j The above and additional ob ects compllshed by such means as are illustrated a UNITED STATES GEORGE B- rn mvo, or 'SMITHVILLE rnnrsjlvnw'ronx, 'AssIenoB. or ONE-HALF TO ATENT; oFrioE.

CLAUDE ADAjMS, OF SMITHVILLEFLATS, NEW YORK."

:envERsiBLE cnmrnnsi 1,109,056. I Specification oftetters Patent li1 iratntea Sept. 1 ,1914. 2

To all whom it may concern .7 Be it known that I, GEORGE B. F NNO,I iL CltlZGll of the Un ted States, residing at.

Smithville Flats, in the county of Olienango and Stateof New York, have inventedcertainnew anduseful Improvements in Reversible Calipers; and I do hereby declare ,thefollowing to be a full, clear, and exact description of the invention, such'as will G-I'lttl'llQ others skilled in the art to which it screw calipers. The principal ob ect of this invention contemplates the provision of calipersin whichthe legs of the instrument may be Application filed April 21, 1913.

swung to bring thoseredges which are nor-;

mally the outer edges into opposing rela tion, and in this manner transform the mstrument from a device for measuring 1nside diameters to an instrument for measurthe accompanying drawings, described 111- the following specification, and then are acmore particularly pointed out inthe claims of this application.

practice, and throughout the severalffvieWs-f ,which are appended hereto and form a part lVith reference to the drawing h of which similar reference numerals desig nate corresponding parts: Figure '1 is 'a' plan view illustrating the caliper legs in their assembled relation when employed in measuring inside diameters; liig. 2 is a similar View illustratin the assembled relation.

of the caliper legs Ywh'en' employed in Incasl ,uring outside diameters, Fig. 3 1s a detail "VIEW-01' the co-actmg. racks formed on the pivoted terminals of the caliper legs; Fig; lis a top plan view of the preferred form? of locking disk employed in connection with z the adjusting screw; F ig; 5 is a side eleVation ofthe locking disk illustrated in Fig. 4-; Fig. 6 is a detail view of the modified form of the locking disk; andFigz'T is a detail view illustrating in section the pivotal' ears employed in securing the adjusting I a member 18 is pivotally secured to the memscrew to the caliper legs. 7

se ial No. 762,677.

and 4, between a pair of head interengage each other in the usual manner, and act to transmit acorrespondmg move- I ment from one leg to another when one of them is swung on its pivot during the ustment of the legs. Each of the measuring legs 1 and 2 carries at its lower termi- ,nal a laterally extending pintle 8.

the caliper is utilized I in measuring inside diameters, the legs 1 and 2 are disposed in such relation to each other that the pintles When 8 extend outwardly from the members 1 vand EZ. When the caliperis employed in measuring outside diameters, however, the legs 1 and 2 are swung to bring the legs 1 and 2 into a position of inward projection from their respective legs as illustrated in 2'. i v v Asa means for adjusting the distance between themeasuring terminals of the two legs and 2, and for permitting the legsto be readily swung from. one position to another, as above described, this invention employs an adjusting screw; 9 adjustably mounted within L11"Op61'l1ng 10 formed, in a pivotedsupporting ear 11, which is mountedupon the leg -l, as illustrated in detail reduced to provide a finger12. The finger 12 'i's 'provided with a notch 13 adjacent its free terminal and .is beveled as at 14, to fain Fig. 7. One t'erminalof the screwv 9 is' cilitate the application of the disk lock to be hereinafter described. In assembling the edjustin g'screw 9, thelinger 12 is projected through airopenmg formed 111 the'ear 15,

similar in construction to the ear 11 and pivotally secured to the 'leg 2, until the threaded portion'bf the screw;9 is in engagement with the inner face of the earl5, and the CllSlLlOCkOijblllS invention is then applied." The preferred embodiment of this disk lock includes a metallic disk 16 formed with a square central opening'17 through \which thefinger 12 is projected. The disk 16 carries a latch member 18, which may be 'formedofa strip ofresilient metal.- The 20 secured to the disk 16. The member 18' is designed to normally close a portionof the openin 17 and, as a means for holdmg the latch in this position, this invention enr ploys a leaf spring 21 secured to the disk by apin and arrangedwith its free-end.

seated in the notch formed in the member 18, as indicated at 23. From the foregoing it will be apparent that when the disk 16 is applied to the finger thebcveled terminal 1 1 of the finger will engage the latch 18, swinging it on its pivot, and that as the tubular projection 2 lcarried on the inner face of the disk 16 engages the adjacent face of the ear 15 thelatch 18 will be forced by the spring 21 downwardly into the notch 13 of the finger 12, thus holding the screwQin the desired position. The member 9 may then be manipulated in the customary manner toadjust the legs on the material.

The modified form of disk lock employed in this invention is illustrated in Fig. 6. In this form the lock includes disk 80 provided with a, square central opening-81, and carrying the leafspring 32 secured to the disk in any desired manner, and arranged to normally close a portion of the opening 31. The application of this 'modified form of disk lock is similar to that abovedescribed to the member 16, it being apparent that as the diskis slipped on the member 12 the member 32 will drop into the notch 13, thus holding the member 9 in the desired position by retaining the finger 12 against withdrawal and holding the terminal of the threaded portion of the member 9 against the'ear 15. in this connec-tion it is to be observed that the lock disks oft-his invention. are designed for the performance of two functions, for they act at once to hold the caliper screw in the desired assembled relation on the legs 1 and 2,

and to afford anoperating handle for adjusting the caliper screw. This latter function is produced by reasonof. the fact that the disks are each provided with a square opening which is of sufiicient size to permit the disk to be mounted on the square finger 12, but is not. large enough .to permit the rotation of the disk on the finger.

From the foregoing it will be seen that when the caliper legs are to be swung from the position in which they are assembled to measure inside diameters, to the position in which they operate to measure outside diameters, as illustrated in Figs. 1 and'2,

respectively, it is only necessary to remove the disk lock and to separate the legs 1 and 2, thus removing the finger 12 from the ear After the legs have beeirswungfrom the position indicated inFi'g. 1 into that'in dicated in Fig. 2, it is only necessary to said ear;

described. I

In reduction to practice, I have found that the form of my invention, illustrated in the drawings and referred to in the above description, as the preferred embodiment, is thelmost efiicient and practical; yet, realizingthat, theconditions concurrent with the adoption of my device will necessarily vary,

I desire to emphasize the fact that various minor changes in, details of construction, proportion and arrangement of parts may be resorted to, when required, without sacrificingv any of the advantages of my invention, as defined in the appended claims.

What is claimed is:

1. A caliper including a head member, a pair of reversible legs pivotally secured thereto, perforate earpivoted on one of said legs, an adjusting screw threaded through said car, a perforate ear pivoted on theother leg, anintegral finger formed on one terminal ofsa-id screw, and operating through said second ear, and adetaohabledisk lock. adapted to be mounted on said finger for holdingsa'id finger against withdrawal'fromsaid ear.

A cal'per including a head member, a

pair of reversible legs pivotally secured thereto, a perforate tear pivotallyattached to one of saidlegs, an adjusting screw threaded through and adjustable in said ear, an integral finger formed on one, terminal of said screw, a perforate ear pivoted on the other leg, and adapted to receivesaid finger, and a detachable disk lock for holdi'ng said finger against withdrawal, from ,3. A caliper including a head member, a pair of reversible legs pivotally secured thereto, a pair of perforate ears pivoted on each of said legs, an adjusting screw threaded througlrand adjustable in one of saidears, an integral finger formed on one terminal ofsaid adjusting screw and operating through the perforation of the other ear, and unitary .means for manipulating said adjustingscrew and holding said finger against withdrawal from said last named ear.

, 4:, A caliperincluding a head member, a

pair of reversible legs pivotally secured thereto, perforate ear for each ,of said leg members, an adjustingscrew threaded through and adjustable in one of said ears,

an integral notched finger formed terminally of saidscrew and extending longitudinally thereof, the other ear being adapted to receive said finger, and unitary means for holding said finger against withdrawal from said last named ear, and for manipulating said adjusting screw, said means including a disk member having acentral opening, and a spring pressed latch member pivoted on said disk and adapted to engage the notch of said finger when in assembled POSI- tion.

5. A caliper including a head member, a pair of leg members plvotally securedv member having a central opening, a latch member pivoted to sa d body member, a leaf spring secured to said body member and bearing against said latch member. 15

In testimonywhereof I afiix my signature in presence of two Witnesses.

' GEORGE B. FENNO.

Witnesses: i I

CARL E. READ,

CLAUDE A.\ADAMS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0., 

